200809296 九、發明說明： 【發明所屬之技術領域】 本發明係-種光學鏡組，朗技—種躺於 化成像用光學鏡組。 于麵小型 【先前技術】 最近幾年來，縣助手機的興起，鏡獅厚度 小’而-般數位相機的感光元件不外乎是⑽⑽D兩種，= 半導齡1程技術的進步，感光元件的晝素大小由早期的7 4咖減 少至目前的L 75_ ’這使得小型化攝影鏡頭的需求更為殷切。〆 習見的手機鏡頭，為考慮像差的補、正，辣用三枚式鏡片結 構，其中最普遍的為正負正Τγι_型式，但是，當鏡頭的高度 由5_縮小至3mm時，成像系_賣縮小，使得三枚鏡片欲置入 此空間變得_，而制厚度也必觸小，使得以_射出成型 製作的1¾片其材質的均勻度不良。 【發明内容】 為解决光n】、型化的問題，本發明提供—種由二牧透鏡構 成之光學鏡組，其要旨如下： -成像用光學鏡組’由二片具屈折力的轉鏡片構成，由物 側至像侧’百先為-具正屈折力的第—透鏡，其前、後表面皆為 6 200809296 ==::表面皆為非球面，一 面皆為非球面。成像用後表面為凸面，且其前表面、後表 並且可使光線在感光元件上的 镜之針田认學鏡組中並設置有一光圈，位於第一透 叙之刖，用於控制光學系的亮度， 入射角有效減少。 又 成像用光學鎊★且φ， ^ . p . 、、 ，、正屈折力的第一透鏡，其折射率為N1， 具負屈折力的第二透鐘， . 、/、折射¥為N2，兩者滿足下記關係： h6 > N1 > 1.5 N2 > 1.55 =可使成像用光學鏡級獲得有效的屈折力，更進一步來看，第 、，斤射率m及第二透鏡折射率N2，需滿足下記關係： N1 > 1.54 N2 < 1.65 成像用光孥鏡組中，系、統的屈折力主要由第一透鏡提供，而 具負屈折力的裳_未 差，曰# 、乐二透鏡其功能為平衡及修正系統所產生的各項像 過上、二其折射率超過此上限值，將使得純的高度增加，因此透 :\ "鏡片折射率的適當配置，將使得成像用光學鏡組在屈折力 與像差的修正巾取得平衡。 成像用光學 負屈折力的第二 鏡組中，具正屈折力的第一透鏡其焦距為fl，具 透鏡其焦距為f2,系統焦距為f，其滿足下記關係： 7 200809296 f/fl > 2.0 丨糊< 1·〇 加大正第-透鏡的屈折力，可以縮短光學鏡組的高度，而且可 以使光線在感光it件上的人㈣有效減少，而具貞屈折力的第二透 鏡，負屈折力來自於前表面，其功用為修正系統所產生的像差，^ 糾屈折力過大，將造成光線在感光元件上的人射角不易壓縮，^ 時’後表面的非球面也將過強而使得製造上較為困難。若考量高階 像差的壓制，以及欲使成_光學鏡組產纽夠的触，則第= 鏡的焦距Π與系統焦距f，需滿足下記關係： f/fl < 2.5 為了有效修正系統產生的色差，控制第—透鏡的色散係數 (Abbe Number) VI及第二透鏡的色散係數（他以此她沈）％， 必須滿足下記關係式： VI > 50 V2 < 40 為了有效縮小光線人射感光元件的角度，第_透鏡前表面曲率 半位R1，第一透叙後表面曲率半徑R2 ,必須滿足以下關係式：、 1.4 < (R1+R2)/(R1~R2) < 1.55 藉由前置光圈的配置，以及第一透鏡後表面提供強大的正屈折 力’將使得成像用光學鏡組的出射瞳(ExitPupil)遠離成像面，因 8 200809296 此’光線離開第二透鏡後表面後，將以接近垂直入射的方式入射在 f光兀件上，此即為像侧的Telecentric特性，此特性對於時下固 ㈣光70件的感光能力是極駿要的，將使得感光元件的感光敏咸 度提高，減少系統產生暗角的可能性。上述關係式稱為透鏡的職 因子，當其數值低於下限值，R2變得相對較小，將使得系統產生 =的像差而難以控制，另一方面，當其數值高於上限值時，貶 =姉較大’第-透鏡後表面的屈折力變小，使得光圈必須前移 才趣小光線人射在感光元件上的角度，而這將會和雜用光學鏡 組小型化的目標相違背。 、此外，成像用光學鏡組小型化的趨勢，以及系統需涵蓋廣泛的 視角，使縣距變得彳隐，在這種情況下，削的曲轉徑以及鏡 片的大小白雙知很小，以傳統玻璃研磨的方法將難以製造出上述的 鏡片，、因此，第—透鏡及第二透鏡皆採用塑膠材質，藉由射域型 的方式製作鏡片，可賴較低廉的成本生產高精密度的鏡片；並於 ^面上設置非球面，非球面可以容易製作成球面以外的形狀，辞 贿多的控制變數，用以消減像差，進而縮減鏡片使_數目。又 ▲有關本案發明為達成上述目的、所採用之技術，手段及其他功 政’紙列舉較佳實施例並配合圖式詳細說明如後。 【實施方式】 9 200809296 本發明第—實酬請參閱第1 ®，第-實施例之像差曲線請參 閱弟2圖。第-實施例的主要構造為：—成像用光學鏡組，由二片 ’、屈折力的塑膠鏡片構成，由物側至像侧依序配置一具正屈折力的 弟一透鏡（2 0)，其前表面（2工）及後表面（2 2)皆為凸面， 其録面（2 0)、後表面（2 1 )皆為非球面，-具負屈折力的 第二透鏡（3 0)，其前表面（3工）為凹面’後表面（3 2)為 凸面，且其前表面（2 0 )、後表面（21)皆為非球面，另在第二 透鏡（3 0)與感光元件（5 〇)中間設置有—紅外線據除渡光片 (IR Cut Filter) ( 4 Q ) ’其不影響系統的焦距。成像 中並設置有，（！◦)，位於第—透賴◦)之前= 制光學系的亮度； 成像用光學鏡組中，具正屈折力的第一透鏡（2 〇),其折射 率Μ = L543，具負屈折力的第二透鏡（3 〇 )，其折射率i 1.583 ； 具正屈折力的第-透鏡（2 〇 )其焦距為fl ^ ^ ^ 丹貞屈折力的 弟二讀（3 0 )其焦距為f2，系統焦距為f，其關係為：洲— 2.2卜 |f/f2| 二 〇·81 ; · — 第一透鏡（2 0 )的色散係數（Abbe Number) v 6〇· 3，第 一( 3 0 )的色散係數（Abbe Number) V2 = 3〇 ? · 10 200809296 第处1兄（2 0 )前表面（2 1 )曲率半徑耵，第一透鏡（2 0 )後表面（2 2 )曲率半徑R2，其關係為： (R1+R2)/(R1-R2) = 1 451 ; 第一透鏡（2 0)前表面（2工）曲率半徑^顚腿； 第透鏡（2 0)及第二透鏡（3 〇)皆採用塑勝材質，藉由 射出成型財式製作制，並於各鏡社設歸球面，非球面曲線 的方程式表示如下： X(YKY7R)/(1+ sqrt (l-(l+k)^(Y/R)2))+A^Y4M6^ 其中： χ·叙>片的截面距離 Y:非球面曲線上的點距離光軸的高度 k:錐面係數 八4、Αδ、......：4階、6階、……的非球面係數。 第貝施例洋細的結構數據如同表一所示，其非球面數據如 同表二所示。 本發明第二實施例請參閱第3圖，第二實施例之像差曲線請參 閱弟4圖。第二實施例的主要構造為：一成像用光學鏡組，由二片 11 200809296 具屈折力的塑膠鏡片槿点， 第一纖⑴，騎表面（=:相置-*正屈折力的 d 1 )及後表面（2 比& 且其前表面（2 0)、後#而广0 白為凸面， 第二透鏡(3 0〜面(夂)皆:非球面，灿 凸面，且其前表面（2())、^31)為凹面’後表面（川為 透鏡（3 0)與感光元件（彳、面（21)皆為非球面，另在第二 ⑽ 一 )(40 中並設置有-光圈（1扑=響咖焦距。她光學鏡組 制光學系嫩； ♦賴（2Q )之前，用於控 成像用光學鏡組中，具正屈折力的第-透鏡（2 0)，其折射 率N1 = h 543’具負屈折力的第二透鏡（30)，其折射率N2 = 1.583 ； 具正屈折力的第一透鏡（2 〇 )其焦距為fl，具負屈折力的 第二透鏡（3 0 )其焦距為f2，系統焦距為f，其關係為·· f/fl = 2·34、|i/f2| 二 0.95 ; 第一透鏡（2 0 )的色散係數（Abbe Number) VI = 60· 3，第 二透鏡（3 0 )的色散係數（Abbe Number) V2 = 30. 2 ; 第一透鏡（2〇)前表面（2 1)曲率半徑R1 ’第一透鏡（2 12 200809296 • 〇 )後表面（2 2 )曲率半徑R2，其關係為： (Rl+R2)/(Ri-R2) = 1.466 ； 第一透鏡（2 0)前表面（2 1)曲率半徑Rl = l· 78647mm; 第一透鏡（2 0)及第二透鏡（3 0)皆採用塑膠材質，藉由 射出成型的方式製作鏡片，並於各鏡面上設置非球面，非球面曲線 方程式的表示同第一實施例的型式； 第二實施例詳細的結構數據如同表三所示，其非球面數據如同 表四所示。 在此先行述明，表一至表四所示為成像用光學鏡組實施例的不 同數值文絲，穌發明各個實施例的數值變化皆屬實驗所得，即 使使用不醜值，相聰構的產品仍應狀本發明的賴範嘴。表 五為各個實施例對應本發明相關方程式的數值資料。 可、 4上所述，本判為—成像用光學鏡組，藉此透鏡#槿iik 列方式與鏡片配置m从 猶叫Μ冓、排 有效鈿小鏡組體積，更能同時獲得較古的 解像力；所以本發明之『且 丁又仔孕乂回的 除此之外，在本雜〜/ 可性』紅毋庸置疑， ^ 一戶、e列所揭露出的特徵技術，於申社之&、， 冒見於諸刊物，亦未曾 於申。月之則亚未 蚁開使用，不但具有如上所述功效增進 13 200809296 • 之事實，更具有不可輕忽的附加功效，是故，本發明的『新穎性j 以及『進步性』都已符合專利法規，爰依法提出發明專利之申請， 祈請惠予審查並早曰賜准專利，實感德便。 14 200809296 * 【圖式簡單說明】 第1圖 第一實施例光學系統示意圖。 . 第2圖 第一實施例之像差曲線圖。 第3圖 第二實施例光學系統示意圖。 - 第4圖 第二實施例之像差曲線圖。 【表】 表一第一實施例結構數據。 表二第一實施例非球面數據。 表三第二實施例結構數據。 表四第二實施例非球面數據。 表五本發明相關方程式的數值資料。 【主要元件符號說明】 光圈（10)第一透鏡（2 0) 前表面（2 1 )後表面（2 2 ) 第二透鏡（3 0 )前表面（3 1 ) 後表面（3 2) 紅外線濾除濾光片（40) 感光元件（5 0) 第一透鏡折射率N1 第二透鏡折射率N2 第一透鏡焦距Π 15 200809296 第二透鏡焦距f2 成像用光學鏡組系統焦距f 第一透鏡色散係數VI (Abbe number) 第二透鏡色散係數V2 (Abbe number) 第一透鏡前表面曲率半徑R1 第一透鏡後表面曲率半徑R2 16200809296 IX. Description of the Invention: [Technical Field to Be Invented by the Invention] The present invention is an optical lens group, which is an optical lens group for lie imaging. Small size [previous technology] In recent years, the rise of the county-assisted mobile phone, the thickness of the mirror lion is small, and the photosensitive elements of the general-purpose digital camera are nothing more than (10) (10) D, = the progress of the semi-guided one-way technology, the photosensitive element The size of the pixel is reduced from the early 7 4 coffee to the current L 75_ ' which makes the demand for miniaturized photographic lenses more demanding. The mobile phone lens that I have seen is a three-lens lens structure for the consideration of aberrations, positive and spicy. The most common one is the positive and negative positive Τ ιι type, but when the height of the lens is reduced from 5 to 3 mm, the imaging system _ Selling shrinks, so that three lenses are intended to be placed in this space, and the thickness is also small, so that the uniformity of the material produced by the _ injection molding is poor. SUMMARY OF THE INVENTION In order to solve the problem of light n-type, the present invention provides an optical lens group composed of a second-grain lens, and the gist thereof is as follows: - an optical lens set for imaging 'two pieces of refractive lens with refractive power The composition, from the object side to the image side, is the first lens with positive refractive power, and the front and back surfaces are all 6 200809296 ==:: the surface is aspheric and both sides are aspheric. The rear surface of the image forming surface is convex, and the front surface and the rear surface thereof are arranged in the lens field of the lens on the photosensitive element and are provided with an aperture, which is located at the first transparent point for controlling the optical system. Brightness, the angle of incidence is effectively reduced. Also for imaging the first lens with optical pounds ★ and φ, ^ . p . , , , , and positive refractive power, the refractive index of which is N1, the second transparent clock with negative refractive power, . , /, the refractive index is N2, The two satisfy the following relationship: h6 > N1 > 1.5 N2 > 1.55 = can achieve effective refractive power for imaging optical mirror level, and further, the first, the yoke rate m and the second lens refractive index N2 The following relationship must be satisfied: N1 > 1.54 N2 < 1.65 In the optical fluoroscope group for imaging, the refractive power of the system and system is mainly provided by the first lens, while the skirt with negative refractive power is not bad, 曰#, Le The function of the two lenses is to balance and correct the various images produced by the system. The refractive index above the upper limit will increase the pure height. Therefore, the appropriate configuration of the refractive index of the lens will make The optical lens for imaging is balanced in the correction of the refractive power and the aberration. In the second lens group for optical negative refractive power for imaging, the first lens with positive refractive power has a focal length of fl, the focal length of the lens is f2, and the focal length of the system is f, which satisfies the following relationship: 7 200809296 f/fl > 2.0 & & 1 1 1 〇 〇 〇 〇 〇 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜 透镜The negative refractive power comes from the front surface, and its function is to correct the aberration generated by the system. If the correction of the refractive power is too large, the angle of the light on the photosensitive element will not be easily compressed, and the aspheric surface of the rear surface will also pass. Strong makes manufacturing more difficult. If you consider the suppression of higher-order aberrations, and the touch that you want to make the _ optics group produce enough, then the focal length 第 of the Mirror and the focal length f of the system must satisfy the following relationship: f/fl < 2.5 In order to effectively correct the system The color difference, which controls the dispersion coefficient of the lens (Abbe Number VI) and the dispersion coefficient of the second lens (which he sinks)%, must satisfy the following relationship: VI > 50 V2 < 40 In order to effectively reduce the light The angle of the photosensitive element, the curvature of the front surface of the _ lens is half-position R1, and the radius of curvature R2 of the first transparent surface must satisfy the following relationship:, 1.4 < (R1+R2)/(R1~R2) < 1.55 By the configuration of the front aperture and the strong positive refractive power of the rear surface of the first lens, the exit pupil of the imaging optics will be moved away from the imaging surface, since 8 200809296 this light leaves the rear surface of the second lens. After that, it will be incident on the f-light element in a manner of near normal incidence, which is the Telecentric characteristic of the image side. This characteristic is extremely important for the photo-sensing ability of 70 pieces of solid (four) light, which will make the photosensitive element Sensitive sensitivity to saltiness increases, minus The system produces the possibility of hidden corners. The above relationship is called the job factor of the lens. When the value is lower than the lower limit value, R2 becomes relatively small, which makes the system produce the aberration of = and is difficult to control. On the other hand, when the value is higher than the upper limit value When 贬=姊 is larger, the refractive power of the rear surface of the lenticular lens becomes smaller, so that the aperture must be moved forward to the angle at which the small light person is incident on the photosensitive element, and this will be miniaturized with the miscellaneous optical lens group. The goal is contrary. In addition, the trend of miniaturization of the optical lens for imaging, and the system need to cover a wide range of perspectives, so that the county distance becomes cumbersome. In this case, the curved diameter of the cut and the size of the lens are small and small. The method of glass grinding will make it difficult to manufacture the above-mentioned lens, and therefore, both the first lens and the second lens are made of a plastic material, and the lens can be produced by a radiation-type method, which can produce a high-precision lens at a relatively low cost; And the aspherical surface is arranged on the surface of the surface, and the aspherical surface can be easily formed into a shape other than the spherical surface, and the control variable of the bribe is used to reduce the aberration, thereby reducing the number of lenses. Further, the invention of the present invention will be described in detail with reference to the preferred embodiments of the present invention in order to achieve the above objects, techniques, means and other features. [Embodiment] 9 200809296 The present invention is the first embodiment, and the aberration curve of the first embodiment is referred to the second diagram. The main structure of the first embodiment is: an optical lens for imaging, which is composed of two plastic lenses of 'refractive force, and a young lens with positive refractive power is arranged from the object side to the image side (20). The front surface (2 work) and the rear surface (2 2) are both convex surfaces, and the recording surface (20) and the rear surface (2 1 ) are aspherical surfaces, and the second lens with negative refractive power (30) ), the front surface (3 working) is a concave surface, the rear surface (3 2) is a convex surface, and the front surface (20) and the back surface (21) are both aspherical surfaces, and the second lens (30) is In the middle of the photosensitive element (5 〇), there is an IR Cut Filter ( 4 Q ) that does not affect the focal length of the system. The image is set with (!◦), before the first pass-through = = the brightness of the optical system; in the optical lens for imaging, the first lens (2 〇) with positive refractive power, the refractive index Μ = L543, second lens with negative refractive power (3 〇), its refractive index i 1.583; first lens with positive refractive power (2 〇) whose focal length is fl ^ ^ ^ The second reading of the bending force of Dan 3 0 ) The focal length is f2, the focal length of the system is f, and the relationship is: continent - 2.2 Bu | f / f2 | 〇 · 81 ; · - The dispersion coefficient of the first lens (2 0 ) (Abbe Number) v 6〇 · 3, the first (3 0 ) dispersion coefficient (Abbe Number) V2 = 3〇? · 10 200809296 The first 1 brother (2 0 ) front surface (2 1 ) radius of curvature 耵, after the first lens (2 0 ) Surface (2 2 ) radius of curvature R2, the relationship is: (R1 + R2) / (R1 - R2) = 1 451; the first lens (20) front surface (2 work) radius of curvature ^ 顚 leg; 2 0) and the second lens (3 〇) are made of plastic material, which is produced by injection molding and is set to be spherical in each mirror. The equation of the aspheric curve is expressed as follows: X(YKY7R)/(1 + sqrt (l-(l+k)^(Y/R)2))+A^ Y4M6^ Where: χ·叙> section distance Y: the height of the point on the aspheric curve from the optical axis k: cone coefficient ar 4, Αδ, ...: 4th order, 6th order, The aspheric coefficient of .... The structural data of the fine details of the first embodiment are shown in Table 1. The aspherical data is shown in Table 2. Referring to Figure 3 for the second embodiment of the present invention, the aberration curve of the second embodiment is shown in Figure 4. The main configuration of the second embodiment is: an optical lens for imaging, which is made up of two pieces of plastic lens with a refractive power of 1109 09296, the first fiber (1), riding surface (=: phase-set -* positive refractive power d 1 ) and the back surface (2 ratio & and its front surface (20), rear #广广0 white is convex, the second lens (30~face (夂) are: aspherical, can convex, and its front surface (2()), ^31) is the concave back surface (Chuan is the lens (30) and the photosensitive element (彳, face (21) are both aspherical, and the second (10) one) (40 is provided with - Aperture (1 flutter = vocal focal length. Her optical lens set optical system is tender; ♦ Lai (2Q), used in the optical lens for control imaging, with a positive refractive power of the first lens (20), Refractive index N1 = h 543' The second lens (30) with negative refractive power has a refractive index N2 = 1.583; the first lens with positive refractive power (2 〇) has a focal length of fl and a second with negative refractive power. The lens (30) has a focal length of f2 and the focal length of the system is f, the relationship is ·· f/fl = 2·34, |i/f2| two 0.95; the dispersion coefficient of the first lens (20) (Abbe Number) VI = 60·3, second lens (3 0) Abbe Number V2 = 30. 2 ; First lens (2〇) front surface (2 1) Curvature radius R1 'First lens (2 12 200809296 • 〇) Rear surface (2 2 ) Curvature radius R2, the relationship is: (Rl + R2) / (Ri - R2) = 1.466; the first lens (20) front surface (2 1) radius of curvature Rl = l · 78647mm; first lens (2 0) and The two lenses (30) are made of plastic material, and the lenses are formed by injection molding, and aspherical surfaces are arranged on each mirror surface. The aspherical curve equation is the same as that of the first embodiment; the detailed structure of the second embodiment The data is shown in Table 3, and the aspherical data is as shown in Table 4. Hereinbefore, Tables 1 to 4 show the different numerical values of the embodiment of the optical lens for imaging, and the numerical values of the various embodiments of the invention are The changes are experimentally obtained, and even if the ugly value is used, the phased product should still be the Laifan mouth of the present invention. Table 5 is the numerical data corresponding to the relevant equations of the present invention in various embodiments. It is judged as an optical lens for imaging, whereby the lens #槿iik column method and lens configuration m from the screaming, sputum effective 钿 small mirror group volume, can get more ancient resolution at the same time; therefore, the invention is also in addition to this, in addition to this, in the miscellaneous ~ / traits There is no doubt about the red dragonfly. ^ The characteristic technology revealed by the households and the e-columns is in the publications of the Shenshe, and it has not been seen in the publications. It has not been used in the application. The moon is not used by the ants, not only has the above effects. Enhancement 13 200809296 • The fact that it has more indispensable additional effects, therefore, the novelty j and the “progressiveness” of the present invention have been in compliance with the patent regulations, and the application for invention patents has been filed according to law, and pray for review. As early as the grant of patents, the real sense of virtue. 14 200809296 * [Simplified description of the drawings] Fig. 1 Schematic diagram of the optical system of the first embodiment. Fig. 2 is a diagram showing aberrations of the first embodiment. Fig. 3 is a schematic view of the optical system of the second embodiment. - Fig. 4 aberration diagram of the second embodiment. [Table] Table 1 shows the structure data of the first embodiment. Table 2 shows the aspherical data of the first embodiment. Table 3 Structure data of the second embodiment. Table 4 shows the aspherical data of the second embodiment. Table 5 Numerical data of the equations of the invention. [Main component symbol description] Aperture (10) First lens (2 0) Front surface (2 1 ) Rear surface (2 2 ) Second lens (30) Front surface (3 1 ) Rear surface (3 2) Infrared filter Divider (40) Photosensitive element (5 0) First lens refractive index N1 Second lens refractive index N2 First lens focal length Π 15 200809296 Second lens focal length f2 Imaging optics system focal length f First lens dispersion coefficient VI (Abbe number) Second lens dispersion coefficient V2 (Abbe number) First lens front surface curvature radius R1 First lens rear surface curvature radius R2 16